mvme3100: Initialize libi2c at device driver order

To use the libi2c, application needs to be configured with

 #define CONFIGURE_APPLICATION_NEEDS_LIBI2C_DRIVER

Update #5387

bsps/powerpc/mvme3100/i2c/i2c_init.c

@@ -86,13 +86,12 @@ BSP_i2c_initialize(void)
 {
 int busno, succ = 0;
 
-	/* Initialize the library */
-	if ( rtems_libi2c_initialize() ) {
-		safe_printf("Initializing I2C library failed\n");
+	/* Register our bus driver */
+	if (!rtems_libi2c_is_initialized){
+		safe_printf("LIBI2C NOT INITIALIZED\n");
 		return -1;
 	}
 
-	/* Register our bus driver */
 	if ( (busno=rtems_libi2c_register_bus(
 					BSP_I2C_BUS0_NAME,
 					BSP_I2C_BUS_DESCRIPTOR) ) < 0 ) {

bsps/powerpc/mvme3100/start/bspstart.c

@@ -448,7 +448,7 @@ static void mvme3100_i2c_initialize(void)
 
 RTEMS_SYSINIT_ITEM(
   mvme3100_i2c_initialize,
-  RTEMS_SYSINIT_BSP_PRE_DRIVERS,
+  RTEMS_SYSINIT_DEVICE_DRIVERS,
   RTEMS_SYSINIT_ORDER_MIDDLE
 );